Heat oil in large stock pot over medium high heat. Cook onions and bell peppers until lightly browned and tender, stirring in garlic when almost done to prevent burning. Stir in tomatoes, vegetable stock, pepper, and chili powder. Reduce heat to low and simmer, uncovered, for 30 minutes. Stir in rice, cover, and simmer another 15 minutes or until rice is tender. Stir in peanut butter until well blended, and serve.
This oddly wonderful combination of ingredients makes a surprisingly different and delicious soup that everyone will enjoy! Serve with a dollop of sour cream on top and some crusty bread for dipping.